9. A is twice as fast as B and together they can com- plete a work in 20 days. In how many days can A alone complete the work?
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A is twice as fast as B means
if A takes x days to finish, B takes 2x days
1/x +1/2x =1/20
x= 30
x is 30 days and 2x is 60 days
so A takes 30 days
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